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Commitments and Contingencies Commitments and Contingencies - Reserves for Legal Claims (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022
Rollforward of reserves for legal claims |  |
Reserves for legal claims, beginning of period | $ 729.1 | $ 577.5
Change in reserves | 179.9 | 186.1
Payments | (50.1) | (34.5)
Reserves for legal claims, end of period | $ 858.9 | $ 729.1

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- Definition Amount of increase (decrease) in loss contingency liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483076/450-20-50-1 + Details
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